Superdeck® Wood Brightener is formulated to brighten grayed, weathered wood. Superdeck Wood Brightener will lift and remove tannin, rust, nail stains and mill glaze from exterior wood and decking. It will bring the natural glow back to your wood, right before your eyes, allowing your coating to look as brilliant as possible. Wood Brightener is a biodegradable brightener and rejeuventator that is safe and effective for use on exterior wood surfaces such as decks, fences, outdoor furniture, siding, log homes and hardwoods. Wood Brightener is concentrated: 1 gallon diluted will make 4 gallons of brightening solution. Wood Brightener is non-flammable, fast-acting, easy to use. For maximum results, use Wood Brightener as the final step to neutralize and brighten wood surfaces that have been treated or cleaned with Superdeck Brand Wood Cleaner or Wood Stripper.